SQL查询可根据所选日期查找值，但如果所选日期没有值，则会查找最新值

Question

I want to get the branch values of the current date, but if there's no value for the current date, get the value of its latest reading.

For example, the selected date is September 29, 2013.

I have three branches.

Two of those branches has sales value for September 29, 2013.

One branch does not have encoded values, but this branch has a latest value date August 30, 2013.

In other words,

Branch 1 - Sep 29 - value is 150
Branch 2 - Sep 29 - value is 150
Branch 3 - Sep 29 - value is 0

I cannot just do 150 + 150 + 0 = 300

What I have to do is:

Branch 1 - Sep 29 - value is 150
Branch 2 - Sep 29 - value is 150
Branch 3 - Sep 29 - value is 0, so find the latest reading, system finds August 30 with value 250.

So now I can do 150 + 150 + 250 = 550

Currently, I have the following SQL query:

SELECT 
    user_id, product_code, uom, inventory_date, account_id, branch_id, beginning_inventory 

FROM 
    inventory_mgmt_uploads 

WHERE 
    user_id = '137'
    AND product_code = 'GRO_AL'
    AND uom = 'box'
    AND account_id = '3'
    AND inventory_date <= '2013-09-29'

ORDER BY
    inventory_date

The result of the query above is:

Now what I want to achieve is this result:

What I've tried is this query:

SELECT 
    user_id, product_code, uom, inventory_date, account_id, branch_id, beginning_inventory 

FROM 
    inventory_mgmt_uploads 

WHERE 
    user_id = '137'
    AND product_code = 'GRO_AL'
    AND uom = 'box'
    AND account_id = '3'
    AND inventory_date <= '2013-09-29'

GROUP BY
    branch_id

ORDER BY
    inventory_date

But it gives me:

Even if I tried to do an order by branch_id desc, or inventory_date desc, I still can't get my desired output. Any ideas what will be the correct query? TIA!

Answer 1

Try this::

Select * from inventory_mgmt_uploads outerimu 
INNER JOIN 
  (  SELECT 
        user_id, MIN(inventory_date) as minInvent, branch_id as Bid, MIN(beginning_inventory) as Binvent

    FROM 
        inventory_mgmt_uploads 

    WHERE 
        user_id = '137'
        AND product_code = 'GRO_AL'
        AND uom = 'box'
        AND account_id = '3'
        AND inventory_date <= '2013-09-29'

    GROUP BY
        branch_id
) as tempTab
    on (tempTab.user_id = outerimu.user_id and tempTab.minInvent=outerimu.inventory_date AND tempTab.Binvent =outerimu.beginning_inventory and tempTab.Bid= outerimu.branch_id)
    ORDER BY
    inventory_date

Answer 2

You can try this also:

SELECT a.USER_ID, a.PRODUCT_CODE, a.UOM, MAX(a.INVENTORY_DATE), a.ACCOUNT_ID, a.BRANCH_ID, (
  SELECT BEGINNING_INVENTORY FROM test 
  WHERE user_id = a.user_id
  AND product_code = a.product_code
  AND uom = a.uom
  AND inventory_date = MAX(a.inventory_date)
  AND account_id = a.account_id
  AND branch_id = a.branch_id
) as BEGINNING_INVENTORY
FROM test as a
WHERE a.INVENTORY_DATE <= '2013-09-29'
GROUP BY a.USER_ID, a.product_code, a.uom, a.account_id, a.branch_id

The query mentioned by Sashi Kant worked correctly because you have sequential data (beginning_inventory decreases with date). If the data was scrambled, the above approach won't give correct data.